igneous
Likely labradorite-bearing rock
Labradorite (plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈)
AI-generated identification · may be incorrectDark gray to black, rough specimen with silvery-blue flashes consistent with feldspar iridescence (labradorescence). Labradorite has Mohs hardness 6–6.5, vitreous-to-pearly luster, triclinic crystals, and two cleavage directions; the image alone cannot confirm the identification or whole-rock composition.
Identified More igneous →
Explore Likely labradorite-bearing rock in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Dark gray to black, rough specimen with silvery-blue flashes consistent with feldspar iridescence (labradorescence). Labradorite has Mohs hardness 6–6.5, vitreous-to-pearly luster, triclinic crystals, and two cleavage directions; the image alone cannot confirm the identification or whole-rock composition.
Formation & geological history
Labradorite crystallizes from cooling magma, commonly in anorthosite and related igneous rocks; these rocks formed in many geological settings and ages.
Uses & applications
Labradorite is used as a decorative and ornamental stone, in jewelry and carvings, and as a collectible mineral.
Geological facts
Its blue-green flashes arise from light interference within microscopic feldspar layers, not from a surface coating.
Field identification & locations
Look for broad blue or silver flashes that change with viewing angle, plus feldspar cleavage; notable sources include Labrador, Canada, and Madagascar. This small, unpolished piece appears suitable for a modest specimen collection.
